Also, wasnt this a Level One assault? Meaning its difficulty level was at the bottom of the possible spectrum? Okay okay so Troll Mercenaries suck. What about the undead one, or the Mamool Ja version, or any of the other combinations? Maybe they just tossed this weak set at us as a test, proving ground. The next few ones they sent out might get progressively harder and harder.
Also, bear in mind, some of them have to be able to be done by groups of people -not- level 75, but possibly 60-65 as well, so to those levels it might pose a vastly challenging prospect, but to a legion of 75's, what besides HNM's and ENM's stands in their way? Not simple mobs, thats for sure.
Like Shyrra said, give it some time.